What happened to Botswana's anti-corruption crusade?

Botswana is lauded as one of the least corrupt countries in Sub-Saharan Africa by organisations such as Transparency International. The consulting firm Cushman & Wakefield released a report in 2015 titled Emerging & Frontier Markets which showed that Botswana is actually the most transparent emerging economy in Africa.

But Serite's arrest has caused some to revisit that praise:

#Botswana government arrests journalist digging into corruption. What happened to the country's famed transparency? #freeSonnySerite

Does it matter how journalists get hold of information to expose corruption?

On Facebook, Radifalana Turpelo Bobo Ronald was of the opinion that journalists should be able to get information by any means:

[…] I still say where there is corruption, it has to be exposed. Action taken against Serite are clear evidence that corruption indeed took place. How he got the info doesn't matter, we need journalists like him who work tirelessly digging info about things that affects Botswana.

But others, such as Yusrah T Gareegope said Serite should answer before the law like anyone else:

detain Sonny Serite until you get whatever info you need from him, he's not the first nor the last to be detained nor is he special from all the other Botswanans who are always detained!